| The major long-chain surfactant monomer (SMA) was synthesised by theresearch group of the author. A kind of quadripolymer (PPSA) was synthetized by anaqueous free radical copolymerization technique using acrylamide(AM)、SAM、AHand AMPS. PPSA showed good-resistance.The dynamic viscoelasticity was studyed.Based on this, this paper getted the the better dissolved and solution performance ofPPSA by improving original synthetic parameters.The Solution properties,floodingperformance and the influence of different types surfactants of PPSA was discussed inthis paper.Microstructure of PPSA solution was investigated to find out therelationship between viseosifieation performance and microstructure.PPSA displayed excellent salt-thicking performance.In30℃，the apparentviscosity solution of1.5g/L and PPSA2g/L PPSA aqueous solution was34mPa·sand49mPa·s, in the range of30~90g/L NaCl, PPSA exhibited good salt-thickening,The viscosity of the solution reached the maximum at90g/L,for446mPa·s and1064mPa·s.The viscosities of PPSA reached up to biggest at170g/L CaCl2,1.5g/L PPSAwas446mPa·s. PPSA solution showed heat-thickening phenomenon after the heatedand sheared function,in80℃, the apparent viscosity of2g/L PPSA solution was still112mPa·s, show the good heat resistance. PPSA is pseudoplastic fluid under theshear.With the increase of shearing rate, the apparent viscosity decreased obviously.In the salt solution, the apparent viscosity of PPSA solution showed good shearresilience because the polymer chain become more stretch by the shear function.In the same injection concentration，PPSA had higher resistance coefficient andresidual resistance coefficient than HPAM. With the injection concentration1.3g/L,resistance coefficient and residual resistance coefficient were20and7.1. The sameconcentration of HPAM was4.2and2.6. Reduced PPSA concentration to1.2g/L, theresistance coefficient and residual resistance coefficient were still14.5and5.8. Thesame concentration of HPAM was only3.3and1.9.The interaction of five different types of surfactant and PPSA saline solution wasstudyed:the apparent viscosity，surfactant tension and interfacial tension were effected obviously, different types of surfactant influence also different,anionic surfactantapparent viscosity of solution the biggest influence,followed by cationic surfactant,non-ionic surfactant affect the minimum. When the concentration of SDBS was0.8mmol/L,the apparent viscosity of composite solution. The cationic surfactant has thebiggest influence for the surface and interfacial tension of composite system,but thephase separation was prone to accidents.The result showed that PPSA/SDBS hasexcellent tackify,surfactant tension and interfacial tension.The hydrophobic microstructure of PPSA was researched using ultravioletspectrum with pyrene as probe. In aqueous solution and90g/L NaCl solutions, withthe increasing of polymer concentrations, the absorbance of the solution enhanced. Inthe low PPSA concentration, by the strongly shielding of Na+, the absorbance ofPPSA in salt solution was lower than those in aqueous solution. When PPSAconcentration was higher than the critical concentration,solution cooperationassociation enhanced, dissolve absorbance increase sharply,the apparent viscositysolution increases rapidly.The molecular chain occured contraction with the adding ofNaCl which lead the absorbance of PPSA salt solution decrease.With the increasing ofNaCl concentration，hydrophobic micro area size increases by the complexation ofNa+and C-O bonds in polymer chains, the solution absorbance increasedobviously.The associating structure in solution becomed too closely with high NaClconcentration, the solution absorbance still increased,but the viscosity began tofall.The variation regulation of solution absorbance with CaCl2concentration wassimilar with the NaCl concentration.The absorbance of PPSA in CaCl2was biggerthan that in NaCl solution,beacuse the stronger complexation of Ca2+and C-Obonds.With the rising of temperature，the hydrogen bonding between PEO and waterwere destroyed. The association of hydrophobic groups becomed stronger and theabsorbance of PPSA salt solution increased.Hydrophobic become too closely inhigh temperature, the absorbency of PPSA solution continued to increase, but theviscosity reduced instead.Hydrodynamics radius distribution of PPSA solution was studyed by dynamicscattering. The results show that PPSA solution which are scattered system.In the lowconcentration, hydrodynamics radius of particles distributed in the singlemolecule,was60–176nm. With the increasing of PPSA concentration, thehydrodynamics radius distribution of particle moved to the big particle radiusassociating area. The hydrodynamics radius0.7g/L PPSA was348nm. In the90g/LNaCl salt solution, when PPSA concentration is higher than the critical concentration,the supramolecular structures associating crosslinking was formed by the enhanced ofhydrophobic associating, the mechanics radius increased sharply.Hydrodynamicsradius distribution was similar in1.5g/L PPSA salt solution with different NaClconcentration. With the increasing of NaCl salt concentration, the number of particlein big radius associating area increased.The Dispersion coefficient and hydrodynamics radius changed change in different scattering angle measured. Staticlight scattering experiment was studyed, the scattering intensity of series PPSAconcentration under different angles were tested, PPSA weight-average molecularweight (Mw) was5.6×106g/mol, the radius of gyration(Rg) was165nm, the secondwilly coefficient(A2) was7x10-6cm3·mol/g2.Atomic force microscope observation shows that PPSA in solution formed uniquesupramolecular structure, further revealed PPSA molecular chain in the brine solutionconformation of stretch.When the concentration of PPSA is0.5g/L,the diameter ofmolecular chain bunch was300-900nm. With the increasing of PPSA concentration,the diameter of molecular chain beam increased obviously. When PPSA concentrationincreased to1.5g/L, The molecular chain bunch diameter of PPSA increasedobviously, about3.8~5.4μm. |
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